Will ammonia kill trees if you spray around to get rid of raccoons?

Liquid ammonia used for this purpose is household cleaning type of ammonia. This should not harm trees at all as your application will be exterior spraying lightly on the surface of the bark of the trees and not soaking the ground with the ammonia in order to reach the roots. A different form of ammonia called ammonium nitrate is a type of fertilizer that is use to feed all types of plants. This type is a mixture of ammonia and nitrogen and is pelletized most of the time for the purpose of feeding. In the manner you are applying it should not harm the trees at all.